<?php

/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2019/8/20
 * Time: 18:13
 */
class 批量过滤postget敏感数据
{

}
//php 批量过滤post,get敏感数据

if (get_magic_quotes_gpc()) {

    $_GET = stripslashes_array($_GET);

    $_POST = stripslashes_array($_POST);

}

function stripslashes_array(&$array) {

    while(list($key,$var) = each($array)) {

        if ($key != 'argc' && $key != 'argv' && (strtoupper($key) != $key || ''.intval($key) == "$key")) {

            if (is_string($var)) {

                $array[$key] = stripslashes($var);

            }

            if (is_array($var)) {

                $array[$key] = stripslashes_array($var);

            }

        }

    }

    return $array;

}

//过滤

function htmlencode($str){

    if(empty($str)) return;

    if($str=="") return $str;

    $str=trim($str);

    $str=str_replace("&","&",$str);

    $str=str_replace(">",">",$str);

    $str=str_replace("<","<",$str);

    $str=str_replace(chr(32)," ",$str);

    $str=str_replace(chr(9)," ",$str);

    $str=str_replace(chr(9)," ",$str);

    $str=str_replace(chr(34),"&",$str);

    $str=str_replace(chr(39),"'",$str);

    $str=str_replace(chr(13),"
     
",$str);

    $str=str_replace("'","''",$str);

    $str=str_replace("select","select",$str);

    $str=str_replace("SCRIPT","SCRIPT",$str);

    $str=str_replace("script","script",$str);

    $str=str_replace("join","join",$str);

    $str=str_replace("union","union",$str);

    $str=str_replace("where","where",$str);

    $str=str_replace("insert","insert",$str);

    $str=str_replace("delete","delete",$str);

    $str=str_replace("update","update",$str);

    $str=str_replace("like","like",$str);

    $str=str_replace("drop","drop",$str);

    $str=str_replace("create","create",$str);

    $str=str_replace("modify","modify",$str);

    $str=str_replace("rename","rename",$str);

    $str=str_replace("alter","alter",$str);

    $str=str_replace("cast","cas",$str);

    return $str;

}

//解码

function htmldecode($str){

    if(empty($str)) return;

    if($str=="") return $str;

    $str=str_replace("select","select",$str);

    $str=str_replace("join","join",$str);

    $str=str_replace("union","union",$str);

    $str=str_replace("where","where",$str);

    $str=str_replace("insert","insert",$str);

    $str=str_replace("delete","delete",$str);

    $str=str_replace("update","update",$str);

    $str=str_replace("like","like",$str);

    $str=str_replace("drop","drop",$str);

    $str=str_replace("create","create",$str);

    $str=str_replace("modify","modify",$str);

    $str=str_replace("rename","rename",$str);

    $str=str_replace("alter","alter",$str);

    $str=str_replace("cas","cast",$str);

    $str=str_replace("&","&",$str);

    $str=str_replace(">",">",$str);

    $str=str_replace("<","<",$str);

    $str=str_replace(" ",chr(32),$str);

    $str=str_replace(" ",chr(9),$str);

    $str=str_replace(" ",chr(9),$str);

    $str=str_replace("&",chr(34),$str);

    $str=str_replace("'",chr(39),$str);

    $str=str_replace("
     
",chr(13),$str);

    $str=str_replace("''","'",$str);

    return $str;

}

// 函数：string_filter($string, $match_type=1)

// 功能：过滤非法内容

// 参数：

// $string 需要检查的字符串

// $match_type 匹配类型,1为精确匹配, 2为模糊匹配，默认为1

//

// 返回：有非法内容返回True，无非法内容返回False

// 其他：非法关键字列表保存在txt文件里, 分为普通非法关键字和严重非法关键字两个列表

// 作者：heiyeluren

// 时间：2006-1-18

//

//======================================================================

function lib_lawless_string_filter($string, $match_type=1)

{

//字符串空直接返回为非法

    $string = trim($string);

    if (empty($string))

    {

        return false;


    }

//获取重要关键字列表和普通关键字列表

    $common_file = "common_list.txt"; //通用过滤关键字列表

    $signify_file = "signify_list.txt"; //重要过滤关键字列表

//如果任何列表文件不存在直接返回false，否则把两个文件列表读取到两个数组里

    if (!file_exists($common_file) || !file_exists($signify_file))

    {

        return false;

    }

    $common_list = file($common_file);

    $signify_list = file($signify_file);

//精确匹配

    if ($match_type == 1)

    {

        $is_lawless = exact_match($string, $common_list);

    }

//模糊匹配

    if ($match_type == 2)

    {

        $is_lawless = blur_match($string, $common_list, $signify_list);

    }

//判断检索结果数组中是否有数据，如果有，证明是非法的

    if (is_array($is_lawless) && !empty($is_lawless))

    {

        return true;

    }

    else

    {

        return false;

    }

}

//---------------------

// 精确匹配,为过滤服务

//---------------------

function exact_match($string, $common_list)

{

    $string = trim($string);

    $string = lib_replace_end_tag($string);

//检索普通过滤关键字列表

    foreach($common_list as $block)

    {

        $block = trim($block);

        if (preg_match("/^$string$/i", $block))

        {

            $blist[] = $block;

        }

    }

//判断有没有过滤内容在数组里

    if (!empty($blist))

    {

        return array_unique($blist);

    }

    return false;

}

//----------------------

// 模糊匹配,为过滤服务

//----------------------

function blur_match($string, $common_list, $signify_list)

{

    $string = trim($string);

    $s_len = strlen($string);

    $string = lib_replace_end_tag($string);

//检索普通过滤关键字列表

    foreach($common_list as $block)

    {

        $block = trim($block);

        if (preg_match("/^$string$/i", $block))

        {

            $blist[] = $block;

        }

    }

//检索严重过滤关键字列表

    foreach($signify_list as $block)

    {

        $block = trim($block);

        if ($s_len>=strlen($block) && preg_match("/$block/i", $string))

        {

            $blist[] = $block;

        }

    }

//判断有没有过滤内容在数组里

    if (!empty($blist))

    {

        return array_unique($blist);

    }

    return false;

}

//--------------------------

// 替换HTML尾标签,为过滤服务

//--------------------------

function lib_replace_end_tag($str)

{

    if (empty($str)) return false;

    $str = htmlspecialchars($str);

    $str = str_replace( '/', "", $str);

    $str = str_replace("\\\\", "", $str);

    $str = str_replace(">", "", $str);

    $str = str_replace("<", "", $str);

    $str = str_replace("", "", $str);

    $str = str_replace("", "", $str);

    $str=str_replace("select","select",$str);

    $str=str_replace("join","join",$str);

    $str=str_replace("union","union",$str);

    $str=str_replace("where","where",$str);

    $str=str_replace("insert","insert",$str);

    $str=str_replace("delete","delete",$str);

    $str=str_replace("update","update",$str);

    $str=str_replace("like","like",$str);

    $str=str_replace("drop","drop",$str);

    $str=str_replace("create","create",$str);

    $str=str_replace("modify","modify",$str);

    $str=str_replace("rename","rename",$str);

    $str=str_replace("alter","alter",$str);

    $str=str_replace("cas","cast",$str);

    $str=str_replace("&","&",$str);

    $str=str_replace(">",">",$str);

    $str=str_replace("<","<",$str);

    $str=str_replace(" ",chr(32),$str);

    $str=str_replace(" ",chr(9),$str);

    $str=str_replace(" ",chr(9),$str);

    $str=str_replace("&",chr(34),$str);

    $str=str_replace("'",chr(39),$str);

    $str=str_replace("
     
",chr(13),$str);

    $str=str_replace("''","'",$str);

    $str=str_replace("css","'",$str);

    $str=str_replace("CSS","'",$str);

    return $str;

//HTML标签，可以作为扩展过滤



}